<!DOCTYPE html>
<html lang="en">

<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <meta http-equiv="X-UA-Compatible" content="ie=edge">
    <title>Document</title>
    <link rel="stylesheet" href="https://cdn.jsdelivr.net/npm/bootstrap@3.3.7/dist/css/bootstrap.min.css">
    <script src="https://cdn.bootcss.com/jquery/3.4.1/jquery.min.js"></script>

</head>

<body>
    <div class="container text-center">
        <label for="" class="col-lg-2">用户名</label> <input type="text" class="user"><br>
        <label for="" class="col-lg-2">密码</label><input type="password" class="pass"><br>
        <label for="" class="col-lg-2">手机</label><input type="number" class="phone"><br>
        <input type="button" value="注册" class="regbtn">
    </div>
    <script src="javascripts/regbtn.js"></script>
</body>

</html>